The U.S. and Europe made good this week on their threats to start penalizing broader sections of Russia's economy in a bid to force President Vladimir Putin to end his support for separatist rebels in Ukraine.

But recent history of the use of financial sanctions by Washington and Brussels—including against Iran, North Korea and Syria—suggests that significantly more pervasive penalties, particularly against Moscow's energy sector, would be needed to change the Kremlin's calculations, said current and former U.S. officials...

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History Suggests Tougher Sanctions Needed in Russia

The U.S. and Europe moved beyond months of warning shots and plunged into a new phase in their economic and diplomatic standoff with Russia, taking aim directly at the Russian economy. WSJ's Marcus Walker joins Simon Constable on the News Hub to discuss. Photo: Getty